Window lock



March 15, 1938; PAVELKA 2,110,940

WINDOW LOCK Filed March 28, 1935 I I I 71 F. Pa veZ/ra A fimm Attorney Patented Mar. 15, 1938 UNITED STATES PATENT OFFIE 1 Claim.

This invention relates to window looks. The primary object of the present invention is to provide a window lock that is adapted for in-- stallation on vertically sliding window sashes,

5 that is easily applied to the window sashes, that is comparatively inexpensive to manufacture, and thoroughly efficient to prevent one sash from being raised with respect to the other sash when in the locked position.

10 With the foregoing and other objects in view the invention consists of a novel construction, combination and arrangement of parts as will be hereinafter more specifically described and illustrated in the accompanying drawing where- 5 in is disclosed an embodiment of the invention,

but it is to be understood that changes, variations and modifications may be resorted to without departing from the spirit of the claim hereunto appended.

In the drawing wherein like reference characters denote corresponding parts throughout the several views:

Figure 1 is a fragmentary sectional view through the upper and lower window sashes showing an adaptation therewith of the window lock in accordance with the present invention.

Figure 2 is a horizontal section through the upper portion of the hood showing the underlying parts of the lock in plan view and in the locked relation.

Figure 3 is a vertical section taken substantially on line 3-3 of Figure 2 and looking in the direction of the arrows.

Referring to the drawing in detail, A indicates a window frame, and B and C indicate respectively the upper and lower sashes of the window sliding vertically in the frame A. Secured to the upper face of the lower rail 5 of the upper window sash B is a rectangular keeper plate 6. Ris- 40 ing above the keeper plate 6 is a centrally apertured keeper knob a the periphery of which slopes outwardly from the top to the bottom thereof to provide a cam periphery l of frusto-conical configuration. A screw 8 extends through the aperture in the knob and is anchored at its inner end to the keeper plate 6 thereby securing the knob a to the plate. Where the lower face of the keeper knob joins the plate 6 there is an annular groove 9 in the knob to receive the pro- 50 jecting ends of the latch levers as will hereafter appear.

On the upper face of the upper rail ID of lower sash C there is a latch plate I I secured thereto by screws l2. A pair of latch levers I 3, I4 are 55 formed of flat straight bars and are pivoted to the latch plate H intermediate their ends by the stud screws I5, l6 and the lower ends of these screws are connected with the plate H. The latch levers I 3, l4 rock on the pivot screws I5,

IS in a horizontal plane and the outer ends of 5 these latch levers extend outwardly from the lower sash C in the path of the upper sash B thereby forming gripping jaws which have arcuate recesses I3 and I l on confronting side edges near their outer ends that engage the 10 opposite sides of the knob a and seat in the annular groove 9 when this groove is brought into registry with the plane of the levers. Outwardly of the pivots l5, [6 there is a coil spring ll connected at its opposite ends to the levers l3, M as at I8, I 9. This spring I! bridges the space between the latch levers l3, l4 and holds them in locked relation in the annular groove 9 on the knob.

A rectangular hood is open at its bottom as 20 will appear in Figures 2- and 3 of the drawing with the outer portion thereof overhanging the path of the upper window sash B. On the inner end of the hood 20 is formed the lateral flanges 2|, by which the hood is secured to the upper face of latch plate II by the screws22. The top wall 23 of the hood 2!] forms a cover for the keeper knob a and the major length of the latch levers I3, [4, while the rear ends of the latch levers extend through a slot or cavity 24 in the hood. On the projecting inner ends of the latch levers I3, M are upstanding vertical gripping fingers 25 which serve to release the levers from locked relation when the said fingers are pressed together. Inside the hood 20 there is a central limit stop in the form of a peg 26 secured to the plate ll between the confronting ends of latch levers l3, l4. On the outside of each lever l3,

I4 is an upstanding peg 21 which serves to limit the space between the outer ends of the levers when they are closed under the tension of spring I! While the central peg 26 limits the width to which the outer end of the latch levers may be opened. Pegs 21 retain the outer ends of the latch levers in spaced relation so that the width between these levers will be such as to engage the cam periphery l and be urged apart thereby when either window sash is moved from open to closed position.

Having thus described the invention, what is claimed as new is:

A window lock comprising a keeper plate adapted to be secured to the lower rail of an upper window sash, a frusto-conical keeper knob secured to the plate and formed with a continuous peripheral groove near the base thereof, a latch plate adapted to be secured to the upper rail of the lower window sash, a pair of elongated straight flat latch levers mounted in side by side relation and formedwith arcuate recesses on confronting sides near the outer ends thereof, pivot studs connecting intermediate portions of the levers to the latch plate to swing in a horizontal plane with the outer ends of the latch levers projecting in the path of the upper sash, a spring connected at its opposite ends to the levers outwardly of the pivot studs to urge them together in locked relation with the recessed edge of the levers seated in the groove on the knob, the inner ends of the levers formed with upstanding gripping fingers to rock the latch levers and release them from the groove and the knob, a single abutment peg anchored to the latch plate inwardly of the pivot studs and between the inner ends of the latch levers to limit the space between the ends of the levers in open position, and a pair of abutment pegs anchored to the latch plate one to the outside of each of the levers and outwardly of the pivot studs to hold the outer ends of the levers in spaced relation when disengaged with the keeper knob so that the levers will be forced apart when the Window is moved from open to closed position whereupon the frustum of the keeper knob enters the space FRANK E. PAVELKA. 

